US1499291A - Process of making compressed fiber board - Google Patents

Description

Patented June 24, 1924.

QNETEE STATES HERMAN M. CAS'INER, OF NO'BLE BQRO, MAINE.

PROCESS OF MAKING COMPRESSED FIBER IBOARD.

No Drawing.

To all whom it may concern:

Be it known that I, HERMAN M. CAsrNER, a citizen of the United States. and resident of Nobleboro, in the county of Lincoln and State of Maine, have invented certain new and useful Improvements in Processes of Making Compressed Fiber Board, of which the following is a specification.

My present invention relates to an im- 1 proved product or article of manufacture which I term Ivory fiber board and to the process of making the same.

The invention aims to produce a product which may be used as a leather substitute in the manufacture of white shoes, though not limited to this use, and which will be flexible and elastic and free from all danger of splitting or cracking.

Th invention further aims to provide a product which may be built up into a number of layers or laminations which will be permanently united and free from all danger of separating.-

A further object is to secure a product which will retain its original color appearance for an indefinite period.

Hth these and other objects in vieW, the invention includes the novel product and process hereinafter described and particularly defined by the appended claims.

In proceeding according to my improved process I take bleached white sulphite wood pulp of the best quality, to which is added about ten per cent of paraflin paper or any form of paraffin waste. This is mixed with water and beat into a pulp by a power heater for the period of an hour or more, depending upon the condition of the material. From there it passes into an agitator tank Where fifty per cent of water is added and the whole thoroughly mixed. It is further put through two centrifugal pumps to get it properly mixed and of the right consistency, passing by means of the pumps into a tank which supplies the material for what is known as a wet machine. This is the machine on which the board is made as later described.

At this point one hundred per cent of water is added and the whole mixture is then picked up by a wire-covered cylinder, passed on to a felt and press roll until roll has accumulated thereon a substance of Application filed August 8, 1921. Serial N o.490,759.'

proper thickness, when it is cut oil, taken from roll and next passed to the dry room.

Three tons of the board as taken from the cylinder produces about one ton of finished product after it has been dried and tempered. In the dry room it is placed upon racks made of wire screening, one sheet upon a rack, these racks being about an inch apart, and dried in a moist atmosphere. which prevents the material from becoming hard and brittle so that it will split in the nailing. or in other words, makes it flexible and elastic. If the board is too soft, it will separate into layers, and if it is too hard it will split in the nailing, but the moist air in drying is What makes it tough, flexible and of the right consistency.

The board is finished by being run through hydraulic rolls under several tons 7 pressure. When finished it is dry, but

tough, flexible and elastic.

The mixture of material makes a fast ivory color which will not change except as the. ivory takes a somewhat deeper shade by age.

The drying is preferably done by steam .in a large room well ventilated, with fans to keep up a circulation of air. It is dried evenly, so that the finished board will not curl up.

I claim:

1. The herein described method which consists in commingling sulphite wood pulp with approximately ten per cent of parafiin and water, thereafter adding additional water to the mass and thoroughly agitating the same. adding further water, and then forming the mixture into sheets, drying the sheets in a moist atmosphere, and subjecting the sheets to pressure.

2. The herein described method which consists in mixing bleached white sulphite wood pulp with approximately ten per cent of paraffin in the presence of water, thoroughly agitating the mixture in the presence of additional Water, forming the mixture into layers, drying said layers in a moist atmosphere, and subjecting the same to pressure.

In testimony whereof, I afiix my signature.

HERMAN M. CASTNER.